Catalina Islands
Costa Rica · Guanacaste
The Catalinas off Costa Rica's Guanacaste coast are seasonal manta and bull shark country — volcanic pinnacles in nutrient rich Pacific water, accessed by 30–45 min boat from Playas del Coco.
How this reef is doing
ⓘ How we measure thisReef state
Bull sharks, mobulas, rays. Eastern Pacific reef ecology is naturally low coral compared to Indo Pacific reefs.
Coral cover
Fish life
Heat
Hot enough that coral is bleaching now.
Fishing
Quiet water, and the protection is actively patrolled.
Sources · MERMAID and partner coral surveys · NOAA Coral Reef Watch · Global Fishing Watch and reef gravity
What you will see
11 species across the dive sites here
Cortez Rainbow Wrasse
Seen 20 days ago
at Cupcakes
Least concern
Whitetip reef shark
Seen 24 days ago
at Cupcakes
Vulnerable
Oceanic manta ray
Seen 2 months ago
at La Pared (The Wall)
Endangered
Pacific green turtle
Seen 3 months ago
at La Pared (The Wall)
Least concern
Giant Pacific Manta Ray
Seen 3 months ago
at Cupcakes
Endangered
King angelfish
Seen 4 months ago
at La Pared (The Wall)
Least concern
Panamic Green Moray
Seen 4 months ago
at Cupcakes
Least concern
Spotted eagle ray
Seen 5 months ago
at La Pared (The Wall)
Vulnerable
Bigeye jack
Seen Jul 2025
at La Pared (The Wall)
Least concern
Munk's devil ray
Seen Mar 2024
at La Pared (The Wall)
Vulnerable
Cow-nosed ray
Seasonal visitor
at La Pared (The Wall)
Near threatened
Dive sites
What divers say
Pacific Costa Rica isn't the prettiest water, but the manta odds in August are absurd.
Good to know
Water temp swings
Thermoclines can drop 8°C. 5mm and a hooded vest are sensible.